Hi,
On glibc 2.3.5 (Linux 2.6.11, ppc32, x86) I'm getting different behaviour than on
2.3.4 when using fopencookie. Example program attached.
On glibc 2.3.4:
[arekm@perfo1 arekm]$ gcc testcookie.c -Wall -O2; ./a.out .bashrc
1: ftell 0
2: fseek ret: 0 ftell 0
3: fseek ret: 0 ftell 5
4: char: s fread ret: 1 ftell: 6
On glibc 2.3.5:
[arekm@iarm ~]$ gcc testcookie.c -Wall -O2 ; ./a.out .bashrc
1: ftell 0
2: fseek ret: 0 ftell 0
3: fseek ret: 0 ftell 0
4: char: ð fread ret: 1 ftell: -1
Could anyone try to run it on 2.3.5? Thanks.
# define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <zlib.h>
#include <libio.h>
static size_t myread(void* myhandle, char* buffer, size_t size)
{
return fread(buffer, 1, size, (FILE*)myhandle);
}
static size_t mywrite(void* myhandle, char* buffer, size_t size)
{
return fwrite(buffer, 1, size, (FILE*)myhandle);
}
static int myseek(void* myhandle, fpos_t* position, int whence)
{
return fseek((FILE*)myhandle, *(unsigned int*)position, whence);
}
static int myclose(void* myhandle)
{
return fclose((FILE*)myhandle);
}
cookie_io_functions_t myfunctions =
{
(cookie_read_function_t*)myread,
(cookie_write_function_t*)mywrite,
(cookie_seek_function_t*)myseek,
(cookie_close_function_t*)myclose
};
int main(int argc, char *argv[])
{
char *path = argv[1];
FILE *zstream;
FILE *stream;
int c, d;
if ((zstream = fopen(path, "r")) != NULL) {
stream = fopencookie(zstream, "r", myfunctions);
if (!stream) {
printf("fopencookie failed\n");
return 1;
}
printf("1: ftell %ld\n", ftell(stream));
d = fseek(stream, 0, SEEK_CUR);
printf("2: fseek ret: %d ftell %ld\n", d, ftell(stream));
d = fseek(stream, 5, SEEK_SET);
printf("3: fseek ret: %d ftell %ld\n", d, ftell(stream));
d = fread(&c, 1, 1, stream);
printf("4: char: %c fread ret: %d ftell: %ld\n", (unsigned char)c, d, ftell(stream));
fclose(zstream);
}
return 1;
}